%0 Journal Article %A Heckman, G. J. %A Opdam, E. M. %T Root systems and hypergeometric functions. I %J Compositio Mathematica %D 1987 %P 329-352 %V 64 %N 3 %I Martinus Nijhoff Publishers %U http://www.numdam.org/item/CM_1987__64_3_329_0/ %G en %F CM_1987__64_3_329_0